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WIP FPC-III support
[linux/fpc-iii.git] / net / rxrpc / sendmsg.c
blobaf8ad6c30b9fb1e756e95db4f7fa37758eaa1800
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* AF_RXRPC sendmsg() implementation.
3 *
4 * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9
10 #include <linux/net.h>
11 #include <linux/gfp.h>
12 #include <linux/skbuff.h>
13 #include <linux/export.h>
14 #include <linux/sched/signal.h>
15
16 #include <net/sock.h>
17 #include <net/af_rxrpc.h>
18 #include "ar-internal.h"
19
20 /*
21 * Return true if there's sufficient Tx queue space.
22 */
23 static bool rxrpc_check_tx_space(struct rxrpc_call *call, rxrpc_seq_t *_tx_win)
24 {
25 unsigned int win_size =
26 min_t(unsigned int, call->tx_winsize,
27 call->cong_cwnd + call->cong_extra);
28 rxrpc_seq_t tx_win = READ_ONCE(call->tx_hard_ack);
29
30 if (_tx_win)
31 *_tx_win = tx_win;
32 return call->tx_top - tx_win < win_size;
33 }
34
35 /*
36 * Wait for space to appear in the Tx queue or a signal to occur.
37 */
38 static int rxrpc_wait_for_tx_window_intr(struct rxrpc_sock *rx,
39 struct rxrpc_call *call,
40 long *timeo)
41 {
42 for (;;) {
43 set_current_state(TASK_INTERRUPTIBLE);
44 if (rxrpc_check_tx_space(call, NULL))
45 return 0;
46
47 if (call->state >= RXRPC_CALL_COMPLETE)
48 return call->error;
49
50 if (signal_pending(current))
51 return sock_intr_errno(*timeo);
52
53 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
54 mutex_unlock(&call->user_mutex);
55 *timeo = schedule_timeout(*timeo);
56 if (mutex_lock_interruptible(&call->user_mutex) < 0)
57 return sock_intr_errno(*timeo);
58 }
59 }
60
61 /*
62 * Wait for space to appear in the Tx queue uninterruptibly, but with
63 * a timeout of 2*RTT if no progress was made and a signal occurred.
64 */
65 static int rxrpc_wait_for_tx_window_waitall(struct rxrpc_sock *rx,
66 struct rxrpc_call *call)
67 {
68 rxrpc_seq_t tx_start, tx_win;
69 signed long rtt, timeout;
70
71 rtt = READ_ONCE(call->peer->srtt_us) >> 3;
72 rtt = usecs_to_jiffies(rtt) * 2;
73 if (rtt < 2)
74 rtt = 2;
75
76 timeout = rtt;
77 tx_start = READ_ONCE(call->tx_hard_ack);
78
79 for (;;) {
80 set_current_state(TASK_UNINTERRUPTIBLE);
81
82 tx_win = READ_ONCE(call->tx_hard_ack);
83 if (rxrpc_check_tx_space(call, &tx_win))
84 return 0;
85
86 if (call->state >= RXRPC_CALL_COMPLETE)
87 return call->error;
88
89 if (timeout == 0 &&
90 tx_win == tx_start && signal_pending(current))
91 return -EINTR;
92
93 if (tx_win != tx_start) {
94 timeout = rtt;
95 tx_start = tx_win;
96 }
97
98 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
99 timeout = schedule_timeout(timeout);
100 }
101 }
102
103 /*
104 * Wait for space to appear in the Tx queue uninterruptibly.
105 */
106 static int rxrpc_wait_for_tx_window_nonintr(struct rxrpc_sock *rx,
107 struct rxrpc_call *call,
108 long *timeo)
109 {
110 for (;;) {
111 set_current_state(TASK_UNINTERRUPTIBLE);
112 if (rxrpc_check_tx_space(call, NULL))
113 return 0;
114
115 if (call->state >= RXRPC_CALL_COMPLETE)
116 return call->error;
117
118 trace_rxrpc_transmit(call, rxrpc_transmit_wait);
119 *timeo = schedule_timeout(*timeo);
120 }
121 }
122
123 /*
124 * wait for space to appear in the transmit/ACK window
125 * - caller holds the socket locked
126 */
127 static int rxrpc_wait_for_tx_window(struct rxrpc_sock *rx,
128 struct rxrpc_call *call,
129 long *timeo,
130 bool waitall)
131 {
132 DECLARE_WAITQUEUE(myself, current);
133 int ret;
134
135 _enter(",{%u,%u,%u}",
136 call->tx_hard_ack, call->tx_top, call->tx_winsize);
137
138 add_wait_queue(&call->waitq, &myself);
139
140 switch (call->interruptibility) {
141 case RXRPC_INTERRUPTIBLE:
142 if (waitall)
143 ret = rxrpc_wait_for_tx_window_waitall(rx, call);
144 else
145 ret = rxrpc_wait_for_tx_window_intr(rx, call, timeo);
146 break;
147 case RXRPC_PREINTERRUPTIBLE:
148 case RXRPC_UNINTERRUPTIBLE:
149 default:
150 ret = rxrpc_wait_for_tx_window_nonintr(rx, call, timeo);
151 break;
152 }
153
154 remove_wait_queue(&call->waitq, &myself);
155 set_current_state(TASK_RUNNING);
156 _leave(" = %d", ret);
157 return ret;
158 }
159
160 /*
161 * Schedule an instant Tx resend.
162 */
163 static inline void rxrpc_instant_resend(struct rxrpc_call *call, int ix)
164 {
165 spin_lock_bh(&call->lock);
166
167 if (call->state < RXRPC_CALL_COMPLETE) {
168 call->rxtx_annotations[ix] =
169 (call->rxtx_annotations[ix] & RXRPC_TX_ANNO_LAST) |
170 RXRPC_TX_ANNO_RETRANS;
171 if (!test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events))
172 rxrpc_queue_call(call);
173 }
174
175 spin_unlock_bh(&call->lock);
176 }
177
178 /*
179 * Notify the owner of the call that the transmit phase is ended and the last
180 * packet has been queued.
181 */
182 static void rxrpc_notify_end_tx(struct rxrpc_sock *rx, struct rxrpc_call *call,
183 rxrpc_notify_end_tx_t notify_end_tx)
184 {
185 if (notify_end_tx)
186 notify_end_tx(&rx->sk, call, call->user_call_ID);
187 }
188
189 /*
190 * Queue a DATA packet for transmission, set the resend timeout and send
191 * the packet immediately. Returns the error from rxrpc_send_data_packet()
192 * in case the caller wants to do something with it.
193 */
194 static int rxrpc_queue_packet(struct rxrpc_sock *rx, struct rxrpc_call *call,
195 struct sk_buff *skb, bool last,
196 rxrpc_notify_end_tx_t notify_end_tx)
197 {
198 struct rxrpc_skb_priv *sp = rxrpc_skb(skb);
199 unsigned long now;
200 rxrpc_seq_t seq = sp->hdr.seq;
201 int ret, ix;
202 u8 annotation = RXRPC_TX_ANNO_UNACK;
203
204 _net("queue skb %p [%d]", skb, seq);
205
206 ASSERTCMP(seq, ==, call->tx_top + 1);
207
208 if (last)
209 annotation |= RXRPC_TX_ANNO_LAST;
210
211 /* We have to set the timestamp before queueing as the retransmit
212 * algorithm can see the packet as soon as we queue it.
213 */
214 skb->tstamp = ktime_get_real();
215
216 ix = seq & RXRPC_RXTX_BUFF_MASK;
217 rxrpc_get_skb(skb, rxrpc_skb_got);
218 call->rxtx_annotations[ix] = annotation;
219 smp_wmb();
220 call->rxtx_buffer[ix] = skb;
221 call->tx_top = seq;
222 if (last)
223 trace_rxrpc_transmit(call, rxrpc_transmit_queue_last);
224 else
225 trace_rxrpc_transmit(call, rxrpc_transmit_queue);
226
227 if (last || call->state == RXRPC_CALL_SERVER_ACK_REQUEST) {
228 _debug("________awaiting reply/ACK__________");
229 write_lock_bh(&call->state_lock);
230 switch (call->state) {
231 case RXRPC_CALL_CLIENT_SEND_REQUEST:
232 call->state = RXRPC_CALL_CLIENT_AWAIT_REPLY;
233 rxrpc_notify_end_tx(rx, call, notify_end_tx);
234 break;
235 case RXRPC_CALL_SERVER_ACK_REQUEST:
236 call->state = RXRPC_CALL_SERVER_SEND_REPLY;
237 now = jiffies;
238 WRITE_ONCE(call->ack_at, now + MAX_JIFFY_OFFSET);
239 if (call->ackr_reason == RXRPC_ACK_DELAY)
240 call->ackr_reason = 0;
241 trace_rxrpc_timer(call, rxrpc_timer_init_for_send_reply, now);
242 if (!last)
243 break;
244 fallthrough;
245 case RXRPC_CALL_SERVER_SEND_REPLY:
246 call->state = RXRPC_CALL_SERVER_AWAIT_ACK;
247 rxrpc_notify_end_tx(rx, call, notify_end_tx);
248 break;
249 default:
250 break;
251 }
252 write_unlock_bh(&call->state_lock);
253 }
254
255 if (seq == 1 && rxrpc_is_client_call(call))
256 rxrpc_expose_client_call(call);
257
258 ret = rxrpc_send_data_packet(call, skb, false);
259 if (ret < 0) {
260 switch (ret) {
261 case -ENETUNREACH:
262 case -EHOSTUNREACH:
263 case -ECONNREFUSED:
264 rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR,
265 0, ret);
266 goto out;
267 }
268 _debug("need instant resend %d", ret);
269 rxrpc_instant_resend(call, ix);
270 } else {
271 unsigned long now = jiffies;
272 unsigned long resend_at = now + call->peer->rto_j;
273
274 WRITE_ONCE(call->resend_at, resend_at);
275 rxrpc_reduce_call_timer(call, resend_at, now,
276 rxrpc_timer_set_for_send);
277 }
278
279 out:
280 rxrpc_free_skb(skb, rxrpc_skb_freed);
281 _leave(" = %d", ret);
282 return ret;
283 }
284
285 /*
286 * send data through a socket
287 * - must be called in process context
288 * - The caller holds the call user access mutex, but not the socket lock.
289 */
290 static int rxrpc_send_data(struct rxrpc_sock *rx,
291 struct rxrpc_call *call,
292 struct msghdr *msg, size_t len,
293 rxrpc_notify_end_tx_t notify_end_tx)
294 {
295 struct rxrpc_skb_priv *sp;
296 struct sk_buff *skb;
297 struct sock *sk = &rx->sk;
298 long timeo;
299 bool more;
300 int ret, copied;
301
302 timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
303
304 /* this should be in poll */
305 sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk);
306
307 if (sk->sk_shutdown & SEND_SHUTDOWN)
308 return -EPIPE;
309
310 more = msg->msg_flags & MSG_MORE;
311
312 if (call->tx_total_len != -1) {
313 if (len > call->tx_total_len)
314 return -EMSGSIZE;
315 if (!more && len != call->tx_total_len)
316 return -EMSGSIZE;
317 }
318
319 skb = call->tx_pending;
320 call->tx_pending = NULL;
321 rxrpc_see_skb(skb, rxrpc_skb_seen);
322
323 copied = 0;
324 do {
325 /* Check to see if there's a ping ACK to reply to. */
326 if (call->ackr_reason == RXRPC_ACK_PING_RESPONSE)
327 rxrpc_send_ack_packet(call, false, NULL);
328
329 if (!skb) {
330 size_t remain, bufsize, chunk, offset;
331
332 _debug("alloc");
333
334 if (!rxrpc_check_tx_space(call, NULL)) {
335 ret = -EAGAIN;
336 if (msg->msg_flags & MSG_DONTWAIT)
337 goto maybe_error;
338 ret = rxrpc_wait_for_tx_window(rx, call,
339 &timeo,
340 msg->msg_flags & MSG_WAITALL);
341 if (ret < 0)
342 goto maybe_error;
343 }
344
345 /* Work out the maximum size of a packet. Assume that
346 * the security header is going to be in the padded
347 * region (enc blocksize), but the trailer is not.
348 */
349 remain = more ? INT_MAX : msg_data_left(msg);
350 ret = call->conn->security->how_much_data(call, remain,
351 &bufsize, &chunk, &offset);
352 if (ret < 0)
353 goto maybe_error;
354
355 _debug("SIZE: %zu/%zu @%zu", chunk, bufsize, offset);
356
357 /* create a buffer that we can retain until it's ACK'd */
358 skb = sock_alloc_send_skb(
359 sk, bufsize, msg->msg_flags & MSG_DONTWAIT, &ret);
360 if (!skb)
361 goto maybe_error;
362
363 sp = rxrpc_skb(skb);
364 sp->rx_flags |= RXRPC_SKB_TX_BUFFER;
365 rxrpc_new_skb(skb, rxrpc_skb_new);
366
367 _debug("ALLOC SEND %p", skb);
368
369 ASSERTCMP(skb->mark, ==, 0);
370
371 __skb_put(skb, offset);
372
373 sp->remain = chunk;
374 if (sp->remain > skb_tailroom(skb))
375 sp->remain = skb_tailroom(skb);
376
377 _net("skb: hr %d, tr %d, hl %d, rm %d",
378 skb_headroom(skb),
379 skb_tailroom(skb),
380 skb_headlen(skb),
381 sp->remain);
382
383 skb->ip_summed = CHECKSUM_UNNECESSARY;
384 }
385
386 _debug("append");
387 sp = rxrpc_skb(skb);
388
389 /* append next segment of data to the current buffer */
390 if (msg_data_left(msg) > 0) {
391 int copy = skb_tailroom(skb);
392 ASSERTCMP(copy, >, 0);
393 if (copy > msg_data_left(msg))
394 copy = msg_data_left(msg);
395 if (copy > sp->remain)
396 copy = sp->remain;
397
398 _debug("add");
399 ret = skb_add_data(skb, &msg->msg_iter, copy);
400 _debug("added");
401 if (ret < 0)
402 goto efault;
403 sp->remain -= copy;
404 skb->mark += copy;
405 copied += copy;
406 if (call->tx_total_len != -1)
407 call->tx_total_len -= copy;
408 }
409
410 /* check for the far side aborting the call or a network error
411 * occurring */
412 if (call->state == RXRPC_CALL_COMPLETE)
413 goto call_terminated;
414
415 /* add the packet to the send queue if it's now full */
416 if (sp->remain <= 0 ||
417 (msg_data_left(msg) == 0 && !more)) {
418 struct rxrpc_connection *conn = call->conn;
419 uint32_t seq;
420
421 seq = call->tx_top + 1;
422
423 sp->hdr.seq = seq;
424 sp->hdr._rsvd = 0;
425 sp->hdr.flags = conn->out_clientflag;
426
427 if (msg_data_left(msg) == 0 && !more)
428 sp->hdr.flags |= RXRPC_LAST_PACKET;
429 else if (call->tx_top - call->tx_hard_ack <
430 call->tx_winsize)
431 sp->hdr.flags |= RXRPC_MORE_PACKETS;
432
433 ret = call->security->secure_packet(call, skb, skb->mark);
434 if (ret < 0)
435 goto out;
436
437 ret = rxrpc_queue_packet(rx, call, skb,
438 !msg_data_left(msg) && !more,
439 notify_end_tx);
440 /* Should check for failure here */
441 skb = NULL;
442 }
443 } while (msg_data_left(msg) > 0);
444
445 success:
446 ret = copied;
447 out:
448 call->tx_pending = skb;
449 _leave(" = %d", ret);
450 return ret;
451
452 call_terminated:
453 rxrpc_free_skb(skb, rxrpc_skb_freed);
454 _leave(" = %d", call->error);
455 return call->error;
456
457 maybe_error:
458 if (copied)
459 goto success;
460 goto out;
461
462 efault:
463 ret = -EFAULT;
464 goto out;
465 }
466
467 /*
468 * extract control messages from the sendmsg() control buffer
469 */
470 static int rxrpc_sendmsg_cmsg(struct msghdr *msg, struct rxrpc_send_params *p)
471 {
472 struct cmsghdr *cmsg;
473 bool got_user_ID = false;
474 int len;
475
476 if (msg->msg_controllen == 0)
477 return -EINVAL;
478
479 for_each_cmsghdr(cmsg, msg) {
480 if (!CMSG_OK(msg, cmsg))
481 return -EINVAL;
482
483 len = cmsg->cmsg_len - sizeof(struct cmsghdr);
484 _debug("CMSG %d, %d, %d",
485 cmsg->cmsg_level, cmsg->cmsg_type, len);
486
487 if (cmsg->cmsg_level != SOL_RXRPC)
488 continue;
489
490 switch (cmsg->cmsg_type) {
491 case RXRPC_USER_CALL_ID:
492 if (msg->msg_flags & MSG_CMSG_COMPAT) {
493 if (len != sizeof(u32))
494 return -EINVAL;
495 p->call.user_call_ID = *(u32 *)CMSG_DATA(cmsg);
496 } else {
497 if (len != sizeof(unsigned long))
498 return -EINVAL;
499 p->call.user_call_ID = *(unsigned long *)
500 CMSG_DATA(cmsg);
501 }
502 got_user_ID = true;
503 break;
504
505 case RXRPC_ABORT:
506 if (p->command != RXRPC_CMD_SEND_DATA)
507 return -EINVAL;
508 p->command = RXRPC_CMD_SEND_ABORT;
509 if (len != sizeof(p->abort_code))
510 return -EINVAL;
511 p->abort_code = *(unsigned int *)CMSG_DATA(cmsg);
512 if (p->abort_code == 0)
513 return -EINVAL;
514 break;
515
516 case RXRPC_CHARGE_ACCEPT:
517 if (p->command != RXRPC_CMD_SEND_DATA)
518 return -EINVAL;
519 p->command = RXRPC_CMD_CHARGE_ACCEPT;
520 if (len != 0)
521 return -EINVAL;
522 break;
523
524 case RXRPC_EXCLUSIVE_CALL:
525 p->exclusive = true;
526 if (len != 0)
527 return -EINVAL;
528 break;
529
530 case RXRPC_UPGRADE_SERVICE:
531 p->upgrade = true;
532 if (len != 0)
533 return -EINVAL;
534 break;
535
536 case RXRPC_TX_LENGTH:
537 if (p->call.tx_total_len != -1 || len != sizeof(__s64))
538 return -EINVAL;
539 p->call.tx_total_len = *(__s64 *)CMSG_DATA(cmsg);
540 if (p->call.tx_total_len < 0)
541 return -EINVAL;
542 break;
543
544 case RXRPC_SET_CALL_TIMEOUT:
545 if (len & 3 || len < 4 || len > 12)
546 return -EINVAL;
547 memcpy(&p->call.timeouts, CMSG_DATA(cmsg), len);
548 p->call.nr_timeouts = len / 4;
549 if (p->call.timeouts.hard > INT_MAX / HZ)
550 return -ERANGE;
551 if (p->call.nr_timeouts >= 2 && p->call.timeouts.idle > 60 * 60 * 1000)
552 return -ERANGE;
553 if (p->call.nr_timeouts >= 3 && p->call.timeouts.normal > 60 * 60 * 1000)
554 return -ERANGE;
555 break;
556
557 default:
558 return -EINVAL;
559 }
560 }
561
562 if (!got_user_ID)
563 return -EINVAL;
564 if (p->call.tx_total_len != -1 && p->command != RXRPC_CMD_SEND_DATA)
565 return -EINVAL;
566 _leave(" = 0");
567 return 0;
568 }
569
570 /*
571 * Create a new client call for sendmsg().
572 * - Called with the socket lock held, which it must release.
573 * - If it returns a call, the call's lock will need releasing by the caller.
574 */
575 static struct rxrpc_call *
576 rxrpc_new_client_call_for_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg,
577 struct rxrpc_send_params *p)
578 __releases(&rx->sk.sk_lock.slock)
579 __acquires(&call->user_mutex)
580 {
581 struct rxrpc_conn_parameters cp;
582 struct rxrpc_call *call;
583 struct key *key;
584
585 DECLARE_SOCKADDR(struct sockaddr_rxrpc *, srx, msg->msg_name);
586
587 _enter("");
588
589 if (!msg->msg_name) {
590 release_sock(&rx->sk);
591 return ERR_PTR(-EDESTADDRREQ);
592 }
593
594 key = rx->key;
595 if (key && !rx->key->payload.data[0])
596 key = NULL;
597
598 memset(&cp, 0, sizeof(cp));
599 cp.local = rx->local;
600 cp.key = rx->key;
601 cp.security_level = rx->min_sec_level;
602 cp.exclusive = rx->exclusive | p->exclusive;
603 cp.upgrade = p->upgrade;
604 cp.service_id = srx->srx_service;
605 call = rxrpc_new_client_call(rx, &cp, srx, &p->call, GFP_KERNEL,
606 atomic_inc_return(&rxrpc_debug_id));
607 /* The socket is now unlocked */
608
609 rxrpc_put_peer(cp.peer);
610 _leave(" = %p\n", call);
611 return call;
612 }
613
614 /*
615 * send a message forming part of a client call through an RxRPC socket
616 * - caller holds the socket locked
617 * - the socket may be either a client socket or a server socket
618 */
619 int rxrpc_do_sendmsg(struct rxrpc_sock *rx, struct msghdr *msg, size_t len)
620 __releases(&rx->sk.sk_lock.slock)
621 __releases(&call->user_mutex)
622 {
623 enum rxrpc_call_state state;
624 struct rxrpc_call *call;
625 unsigned long now, j;
626 int ret;
627
628 struct rxrpc_send_params p = {
629 .call.tx_total_len = -1,
630 .call.user_call_ID = 0,
631 .call.nr_timeouts = 0,
632 .call.interruptibility = RXRPC_INTERRUPTIBLE,
633 .abort_code = 0,
634 .command = RXRPC_CMD_SEND_DATA,
635 .exclusive = false,
636 .upgrade = false,
637 };
638
639 _enter("");
640
641 ret = rxrpc_sendmsg_cmsg(msg, &p);
642 if (ret < 0)
643 goto error_release_sock;
644
645 if (p.command == RXRPC_CMD_CHARGE_ACCEPT) {
646 ret = -EINVAL;
647 if (rx->sk.sk_state != RXRPC_SERVER_LISTENING)
648 goto error_release_sock;
649 ret = rxrpc_user_charge_accept(rx, p.call.user_call_ID);
650 goto error_release_sock;
651 }
652
653 call = rxrpc_find_call_by_user_ID(rx, p.call.user_call_ID);
654 if (!call) {
655 ret = -EBADSLT;
656 if (p.command != RXRPC_CMD_SEND_DATA)
657 goto error_release_sock;
658 call = rxrpc_new_client_call_for_sendmsg(rx, msg, &p);
659 /* The socket is now unlocked... */
660 if (IS_ERR(call))
661 return PTR_ERR(call);
662 /* ... and we have the call lock. */
663 ret = 0;
664 if (READ_ONCE(call->state) == RXRPC_CALL_COMPLETE)
665 goto out_put_unlock;
666 } else {
667 switch (READ_ONCE(call->state)) {
668 case RXRPC_CALL_UNINITIALISED:
669 case RXRPC_CALL_CLIENT_AWAIT_CONN:
670 case RXRPC_CALL_SERVER_PREALLOC:
671 case RXRPC_CALL_SERVER_SECURING:
672 rxrpc_put_call(call, rxrpc_call_put);
673 ret = -EBUSY;
674 goto error_release_sock;
675 default:
676 break;
677 }
678
679 ret = mutex_lock_interruptible(&call->user_mutex);
680 release_sock(&rx->sk);
681 if (ret < 0) {
682 ret = -ERESTARTSYS;
683 goto error_put;
684 }
685
686 if (p.call.tx_total_len != -1) {
687 ret = -EINVAL;
688 if (call->tx_total_len != -1 ||
689 call->tx_pending ||
690 call->tx_top != 0)
691 goto error_put;
692 call->tx_total_len = p.call.tx_total_len;
693 }
694 }
695
696 switch (p.call.nr_timeouts) {
697 case 3:
698 j = msecs_to_jiffies(p.call.timeouts.normal);
699 if (p.call.timeouts.normal > 0 && j == 0)
700 j = 1;
701 WRITE_ONCE(call->next_rx_timo, j);
702 fallthrough;
703 case 2:
704 j = msecs_to_jiffies(p.call.timeouts.idle);
705 if (p.call.timeouts.idle > 0 && j == 0)
706 j = 1;
707 WRITE_ONCE(call->next_req_timo, j);
708 fallthrough;
709 case 1:
710 if (p.call.timeouts.hard > 0) {
711 j = msecs_to_jiffies(p.call.timeouts.hard);
712 now = jiffies;
713 j += now;
714 WRITE_ONCE(call->expect_term_by, j);
715 rxrpc_reduce_call_timer(call, j, now,
716 rxrpc_timer_set_for_hard);
717 }
718 break;
719 }
720
721 state = READ_ONCE(call->state);
722 _debug("CALL %d USR %lx ST %d on CONN %p",
723 call->debug_id, call->user_call_ID, state, call->conn);
724
725 if (state >= RXRPC_CALL_COMPLETE) {
726 /* it's too late for this call */
727 ret = -ESHUTDOWN;
728 } else if (p.command == RXRPC_CMD_SEND_ABORT) {
729 ret = 0;
730 if (rxrpc_abort_call("CMD", call, 0, p.abort_code, -ECONNABORTED))
731 ret = rxrpc_send_abort_packet(call);
732 } else if (p.command != RXRPC_CMD_SEND_DATA) {
733 ret = -EINVAL;
734 } else if (rxrpc_is_client_call(call) &&
735 state != RXRPC_CALL_CLIENT_SEND_REQUEST) {
736 /* request phase complete for this client call */
737 ret = -EPROTO;
738 } else if (rxrpc_is_service_call(call) &&
739 state != RXRPC_CALL_SERVER_ACK_REQUEST &&
740 state != RXRPC_CALL_SERVER_SEND_REPLY) {
741 /* Reply phase not begun or not complete for service call. */
742 ret = -EPROTO;
743 } else {
744 ret = rxrpc_send_data(rx, call, msg, len, NULL);
745 }
746
747 out_put_unlock:
748 mutex_unlock(&call->user_mutex);
749 error_put:
750 rxrpc_put_call(call, rxrpc_call_put);
751 _leave(" = %d", ret);
752 return ret;
753
754 error_release_sock:
755 release_sock(&rx->sk);
756 return ret;
757 }
758
759 /**
760 * rxrpc_kernel_send_data - Allow a kernel service to send data on a call
761 * @sock: The socket the call is on
762 * @call: The call to send data through
763 * @msg: The data to send
764 * @len: The amount of data to send
765 * @notify_end_tx: Notification that the last packet is queued.
766 *
767 * Allow a kernel service to send data on a call. The call must be in an state
768 * appropriate to sending data. No control data should be supplied in @msg,
769 * nor should an address be supplied. MSG_MORE should be flagged if there's
770 * more data to come, otherwise this data will end the transmission phase.
771 */
772 int rxrpc_kernel_send_data(struct socket *sock, struct rxrpc_call *call,
773 struct msghdr *msg, size_t len,
774 rxrpc_notify_end_tx_t notify_end_tx)
775 {
776 int ret;
777
778 _enter("{%d,%s},", call->debug_id, rxrpc_call_states[call->state]);
779
780 ASSERTCMP(msg->msg_name, ==, NULL);
781 ASSERTCMP(msg->msg_control, ==, NULL);
782
783 mutex_lock(&call->user_mutex);
784
785 _debug("CALL %d USR %lx ST %d on CONN %p",
786 call->debug_id, call->user_call_ID, call->state, call->conn);
787
788 switch (READ_ONCE(call->state)) {
789 case RXRPC_CALL_CLIENT_SEND_REQUEST:
790 case RXRPC_CALL_SERVER_ACK_REQUEST:
791 case RXRPC_CALL_SERVER_SEND_REPLY:
792 ret = rxrpc_send_data(rxrpc_sk(sock->sk), call, msg, len,
793 notify_end_tx);
794 break;
795 case RXRPC_CALL_COMPLETE:
796 read_lock_bh(&call->state_lock);
797 ret = call->error;
798 read_unlock_bh(&call->state_lock);
799 break;
800 default:
801 /* Request phase complete for this client call */
802 trace_rxrpc_rx_eproto(call, 0, tracepoint_string("late_send"));
803 ret = -EPROTO;
804 break;
805 }
806
807 mutex_unlock(&call->user_mutex);
808 _leave(" = %d", ret);
809 return ret;
810 }
811 EXPORT_SYMBOL(rxrpc_kernel_send_data);
812
813 /**
814 * rxrpc_kernel_abort_call - Allow a kernel service to abort a call
815 * @sock: The socket the call is on
816 * @call: The call to be aborted
817 * @abort_code: The abort code to stick into the ABORT packet
818 * @error: Local error value
819 * @why: 3-char string indicating why.
820 *
821 * Allow a kernel service to abort a call, if it's still in an abortable state
822 * and return true if the call was aborted, false if it was already complete.
823 */
824 bool rxrpc_kernel_abort_call(struct socket *sock, struct rxrpc_call *call,
825 u32 abort_code, int error, const char *why)
826 {
827 bool aborted;
828
829 _enter("{%d},%d,%d,%s", call->debug_id, abort_code, error, why);
830
831 mutex_lock(&call->user_mutex);
832
833 aborted = rxrpc_abort_call(why, call, 0, abort_code, error);
834 if (aborted)
835 rxrpc_send_abort_packet(call);
836
837 mutex_unlock(&call->user_mutex);
838 return aborted;
839 }
840 EXPORT_SYMBOL(rxrpc_kernel_abort_call);
841
842 /**
843 * rxrpc_kernel_set_tx_length - Set the total Tx length on a call
844 * @sock: The socket the call is on
845 * @call: The call to be informed
846 * @tx_total_len: The amount of data to be transmitted for this call
847 *
848 * Allow a kernel service to set the total transmit length on a call. This
849 * allows buffer-to-packet encrypt-and-copy to be performed.
850 *
851 * This function is primarily for use for setting the reply length since the
852 * request length can be set when beginning the call.
853 */
854 void rxrpc_kernel_set_tx_length(struct socket *sock, struct rxrpc_call *call,
855 s64 tx_total_len)
856 {
857 WARN_ON(call->tx_total_len != -1);
858 call->tx_total_len = tx_total_len;
859 }
860 EXPORT_SYMBOL(rxrpc_kernel_set_tx_length);
Linux with added FPC-III support